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Fixed Assets | 12 Months Ended
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Dec. 31, 2017
Property, Plant and Equipment [Abstract] |
Fixed Assets | Fixed Assets Fixed assets at December 31, 2017 and 2016 consist of the following:
| Cost |  | Accumulated Depreciation and Amortization |  | Net Book Value
As of December 31, 2017 |  |  |  |  |
Leasehold improvements | $ | 14,553,993 |  |  | $ | (2,042,871 | ) |  | $ | 12,511,122 |
Laboratory equipment | 3,787,578 |  |  | (1,724,946 | ) |  | 2,062,632 |
Office furniture and fixtures | 3,366,896 |  |  | (1,471,705 | ) |  | 1,895,191 |
Computer equipment and other | 3,718,266 |  |  | (1,867,035 | ) |  | 1,851,231 |
| $ | 25,426,733 |  |  | $ | (7,106,557 | ) |  | $ | 18,320,176 |
As of December 31, 2016 |  |  |  |  |
Leasehold improvements | $ | 5,248,311 |  |  | $ | (1,199,415 | ) |  | $ | 4,048,896 |
Laboratory equipment | 3,534,302 |  |  | (1,072,188 | ) |  | 2,462,114 |
Office furniture and fixtures | 1,814,493 |  |  | (1,108,187 | ) |  | 706,306 |
Computer equipment and other | 3,684,521 |  |  | (1,876,391 | ) |  | 1,808,130 |
| $ | 14,281,627 |  |  | $ | (5,256,181 | ) |  | $ | 9,025,446 |
Depreciation expense for the years ended December 31, 2017, 2016 and 2015 was $1.9 million, $1.7 million and $1.0 million, respectively. The Company determined that the carrying value of these long-lived assets was not impaired during the periods presented.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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